<template>
  <div>
    <ul>
      <li v-for="(item,index) in arr" :key="item">
        {{item}}
        <button @click='del(index)'>删除</button>
      </li>
    </ul>
    <button @click='fn'>生成</button>
  </div>
</template>

<script>
export default {
    data() {
      return {
        arr:[1,5,3]
      }
    },
    methods:{
      fn() {
        this.arr.push(Math.floor(Math.random()*10))
    
      },
      del(index){
        this.arr.splice(index,1)
      }
    }
}
</script>

<style>

</style>